/bəˈsek·tər/
The bisector of the angle is perpendicular to the line containing the angle.
角の二等分線は、角を含む直線に垂直です。
The bisector of the line segment is the line that passes through the midpoint of the line segment and is perpendicular to the line segment.
線分の二等分線は、線分の中点を通って線分と垂直な線です。